PROPERTY PROVISIONS & CONTRACT LAW · 5 MIN READ

Agency Authority, Certificates, and Estoppel Limits

Producers bind insurers through three layers of authority. Express authority is spelled out in the agency agreement; implied authority covers the acts reasonably necessary to carry out the express grant; and apparent authority arises when the insurer's own conduct leads a reasonable third party to believe the agent has power the agent actually lacks. Even an unauthorized act can bind the insurer through ratification: when the principal, with full knowledge of the agent's unauthorized promise, retains the benefits — keeping the premium, offering renewal — without repudiating, it adopts the act and may be bound by it. The producer-broker distinction matters for whose agent is acting: an agent represents the insurer, while a broker traditionally represents the insured, which shapes both binding power and liability. A producer who promises coverage and fails to procure it faces errors-and-omissions liability — often the injured party's only remedy when the policy itself does not cover the risk. Certificates of insurance are the most litigated paperwork in commercial risk transfer, and the rule is unforgiving: the ACORD 25 certificate is informational only. Its own language states it does not amend, extend, or alter the coverage of the listed policies, and it confers no rights on the holder. A general contractor listed as additional insured on a certificate — even by a hand-marked notation — has no coverage unless an actual additional-insured endorsement or automatic AI wording exists in the policy itself. The broker who issues an unauthorized certificate may face E&O liability, but the certificate cannot conjure coverage. Waiver and estoppel police insurer conduct, but each has boundaries. Waiver is the intentional relinquishment of a known right; estoppel arises when the insurer's representation induces detrimental reliance. The heavily tested limit is the no-coverage-by-estoppel rule: estoppel can defeat an insurer's procedural coverage defense — late notice, a defense waived by conduct — but it cannot create a substantive grant of coverage the policy never contained. A homeowner wrongly told her HO-3 covers flood cannot estop her way into flood coverage; her remedy is a negligence claim against the producer. To defend under a disputed claim without waiving its defenses, the insurer issues a reservation-of-rights letter — a unilateral written notice — or negotiates a non-waiver agreement, which accomplishes the same purpose bilaterally with the insured's signed acknowledgment.